Containment basin for containing liquid spillage from a portable storage tank

Abstract

A containment basin for containing liquid spillage from a portable storage tank in which one end wall is rotatable from an upright operative position to a lowered position aligned with the surrounding floor to enable a portable storage tank to be moved into the containment basin on a wheeled dolly without the need for lifting of the storage tank.

We claim: 
     
       1. A containment basin for containing liquid spillage from a portable storage tank comprising: a bottom panel;   an upstanding wall extending generally upwardly from the periphery of said bottom panel to an upper end of said basin, said upstanding wall having a pair of spaced opposing end portions and spaced opposing side portions, said basin being open at the upper end of said upstanding wall whereby said bottom panel and said wall enclose a volume of space open from above;   hinge means between said bottom panel and one of said end portions for enabling said one end portion to be rotated between an upstanding operative position and a lowered position aligned with a surrounding floor whereby the portable storage tank can be moved onto said bottom panel and removed from said bottom panel on a wheeled dolly without the need for lifting of the portable storage tank; and   seal means between and connected to said one end portion and said side portions for sealing said one end portion to said side portions to prevent leakage of liquid spillage from said containment basin.   
     
     
       2. The containment basin of claim 1 wherein said seal means includes first and second ribbed fan members, said first ribbed fan member being sealingly coupled to said one end portion and to one of said side portions and said second ribbed fan member being sealingly coupled to said one end portion and to the other of said side portions whereby said first and second ribbed fan members form expanding wall portions between said one end portion and said side portions. 
     
     
       3. The containment basin of claim 1 further comprising holding means for selectively holding said one end portion in said upstanding operative position and said lowered position. 
     
     
       4. The containment basin of claim 3 wherein said holding means includes: a holding rod attached to the upper end of said one end portion; and   attaching means for slidably attaching said holding rod to the upper end of one of said side portions, said attaching means including means for selectively securing said holding rod thereto to prevent sliding of said holding rod relative to said side portion whereby said holding rod is operable to hold said one end portion in a selected position.   
     
     
       5. The containment basin of claim 4 wherein said attaching means includes a rod guide attached to said one of said side portions and said means for selectively securing said holding rod thereto includes a thumb screw in said rod guide which can be selectively rotated into a position engaging said holding rod to prevent sliding of said holding rod relative to said rod guide.